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Are Google Webmaster Tools Crawl Errors Right?

Hi, the Crawl Errors list on GWT has been a mystery for me the pass couple of months, it used to show me 30.000 old 404s we had on our site and links from other sites that didn't even existed.

After we fixed the ones that were actually wrong, I saw the number going down as low as 200, that made me very happy, about a month ago we had a widget that was working bad and creating 404s, so my GWT shoot up again to 15.000, not only showing me the recent 404s but all time and non-existent.

Of course I used SEOmoz campaign tracking to find and fix the errors and they where no more than 2000, not the 15k shown in GWT, we fixed them and again the GWT went back down gradually in just a few days to 400, but still only showing old 404s or links from other websites that are not even there any more.

So a couple of days ago, I check my GWT one evening with only a couple of hundred old/non- existing errors, and the next morning I have 33.000 !!!!!! Again old or non existing!!!!! Non of them showing in my SEOmoz Campaings.

Is it worth to be following these numbers in GWT? should I worry about this? is GWT gone Crazy?

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